1 // SPDX-License-Identifier: GPL-2.0
13 #include "rtc-core.h"
19  * ideally UTC.  However, PCs that also boot to MS-Windows normally use
25 name_show(struct device *dev, struct device_attribute *attr, char *buf)  in name_show()  argument
27 	return sysfs_emit(buf, "%s %s\n", dev_driver_string(dev->parent),  in name_show()
28 			  dev_name(dev->parent));  in name_show()
33 date_show(struct device *dev, struct device_attribute *attr, char *buf)  in date_show()  argument
38 	retval = rtc_read_time(to_rtc_device(dev), &tm);  in date_show()
47 time_show(struct device *dev, struct device_attribute *attr, char *buf)  in time_show()  argument
52 	retval = rtc_read_time(to_rtc_device(dev), &tm);  in time_show()
61 since_epoch_show(struct device *dev, struct device_attribute *attr, char *buf)  in since_epoch_show()  argument
66 	retval = rtc_read_time(to_rtc_device(dev), &tm);  in since_epoch_show()
75 max_user_freq_show(struct device *dev, struct device_attribute *attr, char *buf)  in max_user_freq_show()  argument
77 	return sysfs_emit(buf, "%d\n", to_rtc_device(dev)->max_user_freq);  in max_user_freq_show()
81 max_user_freq_store(struct device *dev, struct device_attribute *attr,  in max_user_freq_store()  argument
84 	struct rtc_device *rtc = to_rtc_device(dev);  in max_user_freq_store()
93 		return -EINVAL;  in max_user_freq_store()
95 	rtc->max_user_freq = (int)val;  in max_user_freq_store()
102  * hctosys_show - indicate if the given RTC set the system time
103  * @dev: The device that the attribute belongs to.
111 hctosys_show(struct device *dev, struct device_attribute *attr, char *buf)  in hctosys_show()  argument
115 	    strcmp(dev_name(&to_rtc_device(dev)->dev),  in hctosys_show()
124 wakealarm_show(struct device *dev, struct device_attribute *attr, char *buf)  in wakealarm_show()  argument
130 	 * conceptually one-shot, even though some common RTCs (on PCs)  in wakealarm_show()
134 	 * exact YYYY-MM-DD HH:MM[:SS] date *must* disable their RTC  in wakealarm_show()
135 	 * alarms after they trigger, to ensure one-shot semantics.  in wakealarm_show()
137 	retval = rtc_read_alarm(to_rtc_device(dev), &alm);  in wakealarm_show()
148 wakealarm_store(struct device *dev, struct device_attribute *attr,  in wakealarm_store()  argument
155 	struct rtc_device *rtc = to_rtc_device(dev);  in wakealarm_store()
183 		/* Avoid accidentally clobbering active alarms; we can't  in wakealarm_store()
185 		 * locking from the /dev/rtcN api.  in wakealarm_store()
195 				return -EBUSY;  in wakealarm_store()
197 			return -EINVAL;  in wakealarm_store()
215 offset_show(struct device *dev, struct device_attribute *attr, char *buf)  in offset_show()  argument
220 	retval = rtc_read_offset(to_rtc_device(dev), &offset);  in offset_show()
228 offset_store(struct device *dev, struct device_attribute *attr,  in offset_store()  argument
236 		retval = rtc_set_offset(to_rtc_device(dev), offset);  in offset_store()
243 range_show(struct device *dev, struct device_attribute *attr, char *buf)  in range_show()  argument
245 	return sysfs_emit(buf, "[%lld,%llu]\n", to_rtc_device(dev)->range_min,  in range_show()
246 			  to_rtc_device(dev)->range_max);  in range_show()
264  * is its side effect:  waking from a system state like suspend-to-RAM or
265  * suspend-to-disk.  So: no attribute unless that side effect is possible.
270 	if (!device_can_wakeup(rtc->dev.parent))  in rtc_does_wakealarm()
273 	return !!test_bit(RTC_FEATURE_ALARM, rtc->features);  in rtc_does_wakealarm()
279 	struct device *dev = kobj_to_dev(kobj);  in rtc_attr_is_visible()  local
280 	struct rtc_device *rtc = to_rtc_device(dev);  in rtc_attr_is_visible()
281 	umode_t mode = attr->mode;  in rtc_attr_is_visible()
287 		if (!rtc->ops->set_offset)  in rtc_attr_is_visible()
290 		if (!(rtc->range_max - rtc->range_min))  in rtc_attr_is_visible()
320 		return -EINVAL;  in rtc_add_groups()
323 	groups = rtc->dev.groups;  in rtc_add_groups()
329 	groups = devm_kcalloc(&rtc->dev, new_cnt, sizeof(*groups), GFP_KERNEL);  in rtc_add_groups()
331 		return -ENOMEM;  in rtc_add_groups()
332 	memcpy(groups, rtc->dev.groups, old_cnt * sizeof(*groups));  in rtc_add_groups()
336 	old = rtc->dev.groups;  in rtc_add_groups()
337 	rtc->dev.groups = groups;  in rtc_add_groups()
339 		devm_kfree(&rtc->dev, old);  in rtc_add_groups()
345 int rtc_add_group(struct rtc_device *rtc, const struct attribute_group *grp)  in rtc_add_group()  argument
347 	const struct attribute_group *groups[] = { grp, NULL };  in rtc_add_group()